Construction machine

Abstract

A right front housing cover is arranged in the right side of a working mechanism, and a first control valve is arranged in a front portion side of a valve accommodation room that is covered with the right front housing cover. Further, a signal control valve block is arranged in the back side of the first control valve and in the upper side of the first control valve, and a solenoid valve is arranged in the back side of the signal control valve block. A front surface plate forming part of the right front housing cover has a lower side is inclined in an oblique downward direction toward the forward side, and is arranged along a virtual line that extends in an oblique downward direction through a front end portion of the first control valve and a front end portion of the signal control valve block.

The invention claimed is: 
     
       1. A construction machine comprising:
 an automotive vehicle body ( 2 ,  3 ); 
 a working mechanism ( 4 ) that is tiltably provided in a front portion side of said vehicle body ( 3 ); 
 a cab ( 13 ) that is positioned in the left side of said working mechanism ( 4 ) and is provided in a front portion side in said vehicle body ( 3 ) to define an operator's room; 
 a right front housing cover ( 17 ) that is positioned in the right side of said working mechanism ( 4 ) and is provided in a front portion side in said vehicle body ( 3 ) and within which a valve accommodation room ( 18 ) is formed; 
 a hydraulic pump ( 37 ,  39 ) that is mounted on said vehicle body ( 3 ) to deliver pressurized oil toward a plurality of hydraulic actuators; and 
 an operation device ( 42 ) that is provided in said cab ( 13 ) to be operated by an operator for driving said respective hydraulic actuators, wherein 
 a first control valve ( 21 ) that is configured of a collector of a plurality of directional control valves ( 24 ,  25 ,  26 ,  27 ,  28 ,  29 ) to control a flowing direction of the pressurized oil to be supplied to said respective hydraulic actuators from said hydraulic pump ( 37 ,  39 ), a second control valve ( 34 ) that outputs an operation signal output to said directional control valves ( 24 ,  25 ,  26 ,  27 ,  28 ,  29 ) of said first control valve ( 21 ) from said operation device ( 42 ), and a third control valve ( 35 ) that controls hydraulic equipment including said hydraulic actuator and said hydraulic pump ( 37 ,  39 ), are provided in said right front housing cover ( 17 ), characterized in that: 
 said first control valve ( 21 ) is arranged in a front portion side in said valve accommodation room ( 18 ), 
 said second control valve ( 34 ) is arranged in the back side of said first control valve ( 21 ) and in the upper side of said first control valve ( 21 ), 
 said third control valve ( 35 ) is arranged in the back side of said second control valve ( 34 ), and 
 said right front housing cover ( 17 ) is provided along a virtual line (B-B) extending in an oblique downward direction through a front end ( 22 B) of said first control valve ( 21 ) and a front end ( 34 C) of said second control valve ( 34 ). 
 
     
     
       2. The construction machine according to  claim 1 , wherein
 said right front housing cover ( 17 ) comprises: 
 a left side plate ( 17 A) and a right side plate ( 17 B) that cover said valve accommodation room ( 18 ) from the left side and right side; and 
 a front surface plate ( 17 C) that covers said valve accommodation room ( 18 ) from upward and forward, wherein 
 said front surface plate ( 17 C) is formed in a polygonal shape projecting as a whole, and is provided with a lower side inclined surface portion ( 17 C 4 ) at a halfway section to be inclined in an oblique downward direction toward the forward side, and 
 said lower side inclined surface portion ( 17 C 4 ) is configured to be substantially in parallel with said virtual line (B-B). 
 
     
     
       3. The construction machine according to  claim 1 , wherein
 said second control valve ( 34 ) is arranged in a stepwise manner in the upper side of said first control valve ( 21 ) in a state of overlapping a rear portion side in said first control valve ( 21 ) in the upper-lower direction. 
 
     
     
       4. The construction machine according to  claim 1 , wherein
 a vehicle body frame ( 5 ) that is a base of said vehicle body ( 3 ) comprises: 
 a center frame ( 6 ) including a bottom plate ( 6 A), and left and right vertical plates ( 6 B,  6 C) that are provided to rise on said bottom plate ( 6 A) and extend in the front-rear direction; and 
 a left side frame ( 7 ) and a right side frame ( 8 ) that are arranged in the left side and right side of said center frame ( 6 ), 
 a boom foot portion ( 4 A) of said working mechanism ( 4 ) is rotatably mounted to said left and right vertical plates ( 6 B,  6 C) of said center frame ( 6 ) through a boom foot pin ( 9 ), and 
 said first control valve ( 21 ) and said second control valve ( 34 ) are arranged in the front side of an axis line (A-A) of said boom foot pin ( 9 ). 
 
     
     
       5. The construction machine according to  claim 4 , wherein
 a pin inserting/removing space ( 36 ) is provided between a right side plate ( 17 B) of said right front housing cover ( 17 ) and said right vertical plate ( 6 C) of said center frame ( 6 ) to be positioned in the lower side of said third control valve ( 35 ) for inserting/removing said boom foot pin ( 9 ) in/from said left and right vertical plates ( 6 B,  6 C). 
 
     
     
       6. The construction machine according to  claim 1 , wherein
 a bracket ( 30 ) is provided in said first control valve ( 21 ) to project from the rear portion side to the upward side, wherein said second control valve ( 34 ) and said third control valve ( 35 ) are removably mounted on said bracket ( 30 ). 
 
     
     
       7. The construction machine according to  claim 1 , wherein
 a fuel tank ( 16 ) is positioned in the back side of said right front housing cover ( 17 ) at the right side of said vehicle body ( 3 ) to form a rear surface of said valve accommodation room ( 18 ), and 
 said right front housing cover ( 17 ) is provided with a step ( 19 ) which is a foothold for getting on said vehicle body ( 3 ).